git.m6w6.name Git - awesomized/libmemcached/blob - lib/memcached_get.c

   1 #include "common.h"
   2 #include "memcached_io.h"
   3
   4 static char *memcached_value_fetch(memcached_st *ptr, char *key, size_t *key_length,
   5                                    size_t *value_length,
   6                                    uint16_t *flags,
   7                                    memcached_return *error,
   8                                    char load_key,
   9                                    unsigned int server_key)
  10 {
  11   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  12   char *string_ptr;
  13   char *end_ptr;
  14
  15   assert(value_length);
  16   assert(flags);
  17   assert(error);
  18
  19   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  20   end_ptr= buffer + MEMCACHED_DEFAULT_COMMAND_SIZE;
  21
  22   *value_length= 0;
  23
  24   *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
  25
  26   if (*error == MEMCACHED_SUCCESS)
  27   {
  28     char *next_ptr;
  29
  30     string_ptr= buffer;
  31     string_ptr+= 6; /* "VALUE " */
  32
  33     /* We load the key */
  34     if (load_key)
  35     {
  36       memset(key, 0, MEMCACHED_MAX_KEY);
  37       for (; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++)
  38       {
  39         *key= *string_ptr;
  40         key++;
  41       }
  42     }
  43     else /* Skip characters */
  44       for (; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
  45
  46     if (end_ptr == string_ptr)
  47         goto read_error;
  48
  49     /* Flags fetch move past space */
  50     string_ptr++;
  51     if (end_ptr == string_ptr)
  52         goto read_error;
  53     for (next_ptr= string_ptr; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
  54     *flags= (uint16_t)strtol(next_ptr, &string_ptr, 10);
  55
  56     if (end_ptr == string_ptr)
  57         goto read_error;
  58
  59     /* Length fetch move past space*/
  60     string_ptr++;
  61     if (end_ptr == string_ptr)
  62         goto read_error;
  63
  64     for (next_ptr= string_ptr; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
  65     *value_length= (size_t)strtoll(next_ptr, &string_ptr, 10);
  66
  67     if (end_ptr == string_ptr)
  68         goto read_error;
  69
  70     /* Skip past the \r\n */
  71     string_ptr+= 2;
  72
  73     if (end_ptr < string_ptr)
  74         goto read_error;
  75
  76     if (*value_length)
  77     {
  78       size_t read_length;
  79       size_t to_read;
  80       char *value;
  81       char *value_ptr;
  82
  83       /* We add two bytes so that we can walk the \r\n */
  84       value= (char *)malloc(((*value_length) +2) * sizeof(char));
  85       memset(value, 0, ((*value_length) +2) * sizeof(char));
  86
  87       if (!value)
  88       {
  89         *value_length= 0;
  90         *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  91         return NULL;
  92       }
  93
  94       value_ptr= value;
  95       read_length= 0;
  96       to_read= (*value_length) + 2;
  97
  98       read_length= memcached_io_read(ptr, server_key,
  99                                      value_ptr, to_read);
 100
 101       if (read_length != (size_t)(*value_length + 2))
 102       {
 103         free(value);
 104         goto read_error;
 105       }
 106
 107       return value;
 108     }
 109   }
 110   else if (*error == MEMCACHED_END)
 111     *error= MEMCACHED_NOTFOUND;
 112
 113   return NULL;
 114 read_error:
 115   *error= MEMCACHED_PARTIAL_READ;
 116   return NULL;
 117 }
 118
 119 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
 120                     size_t *value_length,
 121                     uint16_t *flags,
 122                     memcached_return *error)
 123 {
 124   size_t send_length;
 125   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 126   unsigned int server_key;
 127   char *value;
 128   LIBMEMCACHED_MEMCACHED_GET_START();
 129
 130   *value_length= 0;
 131   *error= memcached_connect(ptr);
 132
 133   if (*error != MEMCACHED_SUCCESS)
 134     goto error;
 135
 136   server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
 137
 138   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
 139                         (int)key_length, key);
 140   if ((send(ptr->hosts[server_key].fd, buffer, send_length, 0) == -1))
 141   {
 142     *error= MEMCACHED_WRITE_FAILURE;
 143     goto error;
 144   }
 145
 146   value= memcached_value_fetch(ptr, key, &key_length, value_length, flags,
 147                                error, 0, server_key);
 148   if (*error == MEMCACHED_END && *value_length == 0)
 149   {
 150     *error= MEMCACHED_NOTFOUND;
 151     goto error;
 152   }
 153   else if (*error == MEMCACHED_SUCCESS)
 154   {
 155     memcached_return rc;
 156     /* We need to read END */
 157     rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
 158
 159     if (rc != MEMCACHED_END)
 160     {
 161       *error= MEMCACHED_PROTOCOL_ERROR;
 162       goto error;
 163     }
 164   }
 165   else
 166       goto error;
 167
 168   LIBMEMCACHED_MEMCACHED_GET_END();
 169
 170   return value;
 171
 172 error:
 173   free(value);
 174   *value_length= 0;
 175
 176   LIBMEMCACHED_MEMCACHED_GET_END();
 177
 178     return NULL;
 179 }
 180
 181 memcached_return memcached_mget(memcached_st *ptr,
 182                                 char **keys, size_t *key_length,
 183                                 unsigned int number_of_keys)
 184 {
 185   char buffer[HUGE_STRING_LEN];
 186   unsigned int x;
 187   memcached_return rc;
 188   memcached_string_st **cursor_key_exec;
 189   LIBMEMCACHED_MEMCACHED_MGET_START();
 190
 191   ptr->cursor_server= 0;
 192   memset(buffer, 0, HUGE_STRING_LEN);
 193
 194   rc= memcached_connect(ptr);
 195
 196   if (rc != MEMCACHED_SUCCESS)
 197     return rc;
 198
 199   cursor_key_exec= (memcached_string_st **)malloc(sizeof(memcached_string_st *) * ptr->number_of_hosts);
 200   memset(cursor_key_exec, 0, sizeof(memcached_string_st *) * ptr->number_of_hosts);
 201
 202
 203   for (x= 0; x < number_of_keys; x++)
 204   {
 205     unsigned int server_key;
 206
 207     server_key= memcached_generate_hash(keys[x], key_length[x]) % ptr->number_of_hosts;
 208
 209     if (cursor_key_exec[server_key])
 210     {
 211       memcached_string_st *string= cursor_key_exec[server_key];
 212
 213       memcached_string_append_character(ptr, string, ' ');
 214       memcached_string_append(ptr, string, keys[x], key_length[x]);
 215     }
 216     else
 217     {
 218       memcached_string_st *string= memcached_string_create(ptr, SMALL_STRING_LEN);
 219
 220       /* We need to figure out the correct way to error in case of this failure */
 221       if (!string)
 222         assert(0);
 223
 224       memcached_string_append(ptr, string, "get ", 4);
 225       memcached_string_append(ptr, string, keys[x], key_length[x]);
 226
 227       cursor_key_exec[server_key]= string;
 228     }
 229   }
 230
 231
 232   /*
 233     Should we muddle on if some servers are dead?
 234   */
 235   for (x= 0; x < ptr->number_of_hosts; x++)
 236   {
 237     if (cursor_key_exec[x])
 238     {
 239       memcached_string_st *string= cursor_key_exec[x];
 240       memcached_string_append(ptr, string, "\r\n", 2);
 241
 242       if ((send(ptr->hosts[x].fd, string->string,
 243                  memcached_string_length(ptr, string), 0) == -1))
 244       {
 245         memcached_quit(ptr);
 246         rc= MEMCACHED_SOME_ERRORS;
 247       }
 248       memcached_string_free(ptr, string);
 249       cursor_key_exec[x]= NULL; /* Remove warning */
 250     }
 251   }
 252
 253   free(cursor_key_exec);
 254
 255   LIBMEMCACHED_MEMCACHED_MGET_END();
 256   return rc;
 257 }
 258
 259 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 260                     size_t *value_length,
 261                     uint16_t *flags,
 262                     memcached_return *error)
 263 {
 264   char *value_check;
 265
 266   while (ptr->cursor_server < ptr->number_of_hosts)
 267   {
 268     value_check= memcached_value_fetch(ptr, key, key_length, value_length, flags,
 269                                        error, 1, ptr->cursor_server);
 270
 271     if (*error == MEMCACHED_NOTFOUND)
 272       ptr->cursor_server++;
 273     else if (*error != MEMCACHED_SUCCESS)
 274       return NULL;
 275     else
 276       return value_check;
 277   }
 278
 279   return NULL;
 280 }